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Author
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Topic: cant get car to idle right
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Adam5.0
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Member # 6995
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posted
 
 
i just put in a 306. I set fuel pressure a 40psi with no vacuum. I move the #1 piston to tdc and i cant get it to idle at the right speed without dying with the timing set at 10 degrees. when it is set at 10 it doesnt want to idle below at about 1000 rpm. i have adjusted the idle screw to get it to idle at the right speed the car will just die. the only way i can get it to idle is with the timing set at 0. with the timing set at 0 it does have a little bit of a surging problem. any input would help thanks.
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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Adam5.0
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Member # 6995
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posted
a little more info. the motor will surge from about 700 rpm to 1200 rpm then settle down at about 900 rpm then start surging again and then eventually stall. checked tps and IAC both checked out ok.
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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TOPnotch
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Member # 1340
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posted
Vacuum leak
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The bitterness of poor quality remains long after the sweetness of low price is forgoten!!!
1QWKCHP
1QWKDRP
Posts: 2255 | From: Hayward | Registered: May 2002
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by TOPnotch:
Vacuum leak
big one ![[Smile]](smile.gif) Check your upper to lower intake gasket and make sure it is seated properly.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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Adam5.0
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Member # 6995
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posted
double checked vacuum lines couldnt find anything. if it is a vacuum leak why would the idle be stable with base timing set at zero?
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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TOPnotch
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Member # 1340
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posted
The 5.0 cars tend to idle surge and do funny things when the tps voltage is out of range. If the car has an aftermarket cam you probably have the throttle blade open too far to get the car to idle and the tps voltage is over 1v Then you are compensating for it by retarding the timing. Put the initial timing off the crank back to 10 btdc thats where it should be. (with the spout connector un plugged of coarse) Adjust the idle and tps voltage from there. You will most likely have to slot the holes in the tps sensor to get it in range. You are looking for just under 1v at idle like .9 ect
Try that if you haven't yet
![[patriot]](graemlins/patriot.gif)
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The bitterness of poor quality remains long after the sweetness of low price is forgoten!!!
1QWKCHP
1QWKDRP
Posts: 2255 | From: Hayward | Registered: May 2002
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Blind
2.3L
CAFords OG
Member # 3052
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posted
quote:
Originally posted by Adam5.0:
double checked vacuum lines couldnt find anything. if it is a vacuum leak why would the idle be stable with base timing set at zero?
how much vacuum do you get at idle?
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89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
Posts: 8521 | From: Fairfield | Registered: Jul 2003
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Adam5.0
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Member # 6995
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posted
i have a tfs stage 1 cam with 1.7rr. i havent hooked a vacuum gauge to it yet. i gonna try to play with the idle screw and tps some more. thanks for the help
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want something old and japanese
Posts: 1609 | From: Brentwood | Registered: Aug 2006
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89saleen
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Member # 3083
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posted
Check the Idle Air Bypass solenoid- aka IAB..(the thing on the side of the EGR spacer)first check to see if its clogged with carbon, second see if it has smooth operation and isnt sticky, also try unplugging it & see if it affects the surge. Ford does make a plate to adjust the airflow to it, but I made my own; I cut out a gasket with smaller air holes to meter the air.. seemed to help my surge. Ive found that the IAB dosent deal well with aftermarket cams. Good luck.
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Its over Johnny-
Posts: 316 | From: Palo Alto | Registered: Jul 2003
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BCINGUU
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Member # 2397
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posted
Be careful tampering with that idle screw. It can be very difficult to reset to the factory setting if you ever want to do that, which you probably will once you solve your idle problem.
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93 Cobra #4563 347ci 12.0@118 505rwhp 524tq
90 GT "Saleen Cobra" style convertible 347ci
67 GT "Eleanor" style coupe 347ci
Posts: 1425 | From: San Jose, CA | Registered: Jan 2003
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Stan G
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Member # 6226
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posted
If you don't have a vacuum leak,
I think you're supposed to :
1. disconnect the battery, step on the brake 3 or
4 times to reset the ecu ,
reconnect the battery
2 warm up the car
3 disconnect the iac
4 set the idle speed using the idle adjust
screw.
5 plug the iac back in .
The computer will adapt after a while to what you set the idle to, but it may hunt for a while .
I think mine took a few days till It worked ok
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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